Jikan Akima Jinbutsu
This is a very odd manga, but I actually kinda liked it. It's really dark and pretty depressing, but it's an interesting kind of twisted. There are four short stories, and only two of them are overtly BL, whereas the other two are sort of open to interpretation, I suppose. If you like dark, messed up stories, you should find these entertaining. It's definitely not for fans of a happy ending. This is more on the horror side than the romance side.
Double Mints
Cold Rain Of Happiness
I read this ages ago, and it's still as weird as I remember. It is indeed strange and very disturbing, but I wouldn't say it's the most shocking thing I've ever seen. Maybe I've been reading yaoi too long. Rape is so common in yaoi, but maybe the fact that it's portrayed as awful and traumatizing, instead of the first stages of romance, and because of the bestiality element, people are horrified. Oh well, at least it's pretend.
Kusatta Rasen
It's not a dynamic I'd typically be about, but I'd actually read more of this if it existed. Oddly alluring.
Nishikaidan No Akuma